问题描述:
关于声现象,下列说法正确的是( )A. 声波和电磁波一样能在真空中传播
B. 超声波在空气中的传播速度约是3×108m/s
C. 成语“声如洪钟”形容说话或歌唱时声音洪亮,它描述的是声音的响度大
D. 通过居民区的高速铁路加装隔音屏障是为了防止噪声的产生
最佳答案:
A、声音的传播需要介质,声音不能在真空中传播,故A错误;
B、超声波也是声波,声波在空气中的传播速度为340m/s,故B错误;
C、成语“声如洪钟”形容说话或歌唱时声音洪亮,它描述的是声音的响度,故C正确;
D、通过居民区的高速铁路需加装隔音屏障是在传播过程中减弱噪音,但不能防止噪声的发生,故D错误.
故选:C.
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